Annual report pursuant to Section 13 and 15(d)

Product Warranties (Details)

v2.4.0.6
Product Warranties (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Changes in Company's product warranty reserve      
Total product warranty reserve at the beginning of the period $ 243 $ 758 $ 1,263
Warranty reserve acquired from ANTONE 25    
Specific pre-acquisition ANTONE product warranty in excess of acquired limit 303    
Warranty reserve held-for-sale transferred with sale of CNS   (194) 0
Warranty expense (reversal) (45) (89) (223)
Utilization (374) (232) (282)
Total product warranty reserve at the end of the period $ 152 $ 243 $ 758